|Publication number||US7016113 B2|
|Application number||US 10/157,196|
|Publication date||Mar 21, 2006|
|Filing date||May 30, 2002|
|Priority date||May 28, 1997|
|Also published as||US6292296, US6639720, US7016112, US7911696, US20020141059, US20020145799, US20020176168|
|Publication number||10157196, 157196, US 7016113 B2, US 7016113B2, US-B2-7016113, US7016113 B2, US7016113B2|
|Inventors||Jae Beom Choi, Byung Duck Song, Ki Hyuk Yoon|
|Original Assignee||Lg.Philips Lcd Co., Ltd.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (74), Non-Patent Citations (34), Referenced by (5), Classifications (7), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a divisional of application Ser. No. 09/618,165 filed Jul. 17, 2000, which is a continuation of application Ser. No. 09/084,583, filed May 27, 1998, now U.S. Pat. No. 6,292,296 which is hereby incorporated by reference for all purposes as if fully set forth herein.
A. Field of the Invention
The present invention relates to a polarizer and a polarizer system, and more particularly to a large scale polarizer and a polarizer system employing the large scale polarizer.
B. Description of the Related Art
Generally, a liquid crystal display device (LCD) comprises upper and lower substrates placed to face each other with a specific interval by a spacer, and a liquid crystal (LC) layer formed between the upper and lower substrates. The upper and lower substrates respectively have electrodes with specific patterns on their faced sides. And an alignment layer is formed over the electrodes to impart a pretilt angle on the LC.
For aligning the alignment layer, it has been proposed to use a rubbing method, a photo-alignment method or the like.
The rubbing method comprises depositing an alignment material, such as polyimide (PI), on a substrate and imparting the pretilt on the LC by rubbing the substrate with a rubbing cloth. Using this method, it is possible to make a large scale LCD and to align the alignment layer relatively quickly.
In the above described rubbing process, however, defects are generated by the microgrooves of the alignment layer which cause a light scattering and a random phase distortion. Moreover, dust particles and electrostatic discharge are produced in the alignment layer, so that a thin film transistor of the substrate is damaged and the yield is decreased.
On the other hand, the photo-alignment method imparts the pretilt on the LC by irradiating an ultraviolet light over a substrate having a photo-alignment layer. Compared with the rubbing method, there is no electrostatic discharge or dust particles, and thus the low yield problem is obviated. Moreover, it could control simultaneously the pretilt throughout the alignment layer, and this uniformly arrange the LC molecules. Therefore, there are several advantages, including preventing the random phase distortion or the light scattering from defects generated by the microgrooves.
At this time, to obtain a linearly or a partially polarized ultraviolet light, a polarizer polarizing an incident light from a light source is used. Particularly, the characteristics of the polarizer used in the photo-alignment process require that it be possible to apply to the large scale, to use in the ultraviolet light range, and to have an endurance, a heat resistance and a high light-transmittance.
In the conventional polarizer, however, because it is small, it is difficult to apply to the photo-alignment process of a large scale LCD. And in the case of the polarizer having an absorptive mode on which polymers are deposited, the endurance and heat resistance properties are poor, the wavelength of incident light is limited.
Accordingly, an object of the present invention to provide a large scale polarizer securing an uniformity of the illuminance thereof, for use in a photo-alignment process of fabricating a large scale LCD.
It is another object of the present invention to provide a polarizer system employing the large scale polarizer to simplify the process and to simplify a driving system of the polarizer.
Additional objects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objects and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the appended claims.
To achieve the objects and in accordance with the purpose of the invention, as embodied and broadly described herein, the large scale polarizer of the present invention comprises: a plurality of quartz substrate parts, each quartz substrate part including one or more quartz substrates; and a polarizer holder supporting said plurality of quartz substrate parts.
In another aspect of the invention, the polarizer system employing the large scale polarizer of the present invention comprises: a light source for generating a light; a plurality of quartz substrate parts, each quartz substrate part including one or more quartz substrates; a polarizer holder supporting said plurality of quartz substrate parts; and means for directing said light onto said plurality of quartz substrate parts.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
Generally, a light used in a photo-alignment process is an ultraviolet light, and more particularly a light used as a polarized light is an ultraviolet light having a wavelength approximately between 280 nm and 320 nm.
As shown in
At this time, the Brewster's angle θB is described as follows. If the unpolarized light is incident on the surface of quartz substrate 1 at the Brewster's angle, the reflected light is made linearly polarized with the electric vector transverse to the plane of incidence. The transmitted light is partially polarized.
As shown in
On the other hand, as shown in
As shown in
As previously mentioned, when the number of the quartz substrates a linearly polarized light. Hence, it is possible to obtain a linearly or a partially polarized light easily by controlling the number of the quartz substrates.
Large scale polarizer 10 comprises one or more quartz substrate parts 15 formed as a rectangle, and polarizer holders 13 formed as a lattice structure supporting quartz substrate part 15.
Each quartz substrate part 15 comprises one or more layers of quartz substrates, polarizes an incident light, and is positioned at the Brewster's angle against the incident light. Polarizer holder 13 includes an optically absorptive material. The marks a and b represent the interval between adjacent polarizer holders 13 in X axis and Y axis.
Compared with the conventional polarizer, in the present large scale polarizer, a plurality of quartz substrate parts 15 are linked by polarizer holders 13 like a lattice structure, and it is possible to apply to a large scale LCD.
As shown in
Among the unpolarized parallel lights of incidence, the light reflected by quartz substrate part 15 is absorbed by polarizer holder 13, and the light transmitted by quartz substrate part 15 is irradiated over an alignment layer 50 (see
In large scale polarizer 10, the polarization degree needed is obtained by controlling the number of layers of the quartz substrates in quartz substrate part 1 S. Therefore, if it is desired to obtain a linearly polarized light according to a characteristic of the photo-alignment, the quartz substrate part is formed by using layers of quartz substrate having over a specific number of quartz substrate. And, to obtain a partially polarized light, the quartz substrate part is formed of one or any appropriate number of quartz substrates.
Furthermore, since the large scale polarizer consistent with the present invention, as compared with the conventional polarizer, does not select an absorption mode, it should be possible to use semi-permanently, its endurance is good, and there is no dependence of wavelength.
As shown in
A light from a lamp 7 is reflected by a cold mirror 61 onto a small scale polarizer 20, focused by a fly eye lens (homogenizer) 31, and transmitted by another small scale polarizer 40. The light is reflected again by a reflective mirror 63 onto a collimation lens, the light recollimated and focused becomes an unpolarized parallel light. The unpolarized parallel light is incident at the Brewster's angle θB on the quartz substrate part of large scale polarizer 10. And a part of the light is reflected, and other part of the light is transmitted and irradiated over an alignment layer 50 on a substrate 70 supported on a stage 75 after passing a mask 80. Moreover, the polarizer system further comprises a first moving control party 90 a moving the large scale polarizer in the X axis direction and second moving control part 90 b moving the large scale polarizer in the Y axis direction in
To obtain the uniformity of the illuminance of the light irradiated on alignment layer 50, it is preferable that large scale polarizer 10 is placed having a specific interval from alignment layer 50. This is because the polarizer holder makes the illuminance of the light reaching on the alignment layer uneven depending on the position as shown in
When first moving control part 90 a makes large scale polarizer 10 move in a specific direction (for example, along the X axis in
Therefore, in connection with performing the photo-alignment process using the polarizer system employing the large scale polarizer, when the distance between the adjacent polarizer holders along the X axis is a, first moving control part 90 a oscillates large scale polarizer 10 for a distance of aħδ(δ<<a) one or more times along the X axis during the photo-alignment stage. In the same manner, when the distance between the adjacent polarizer holders along the Y axis is b, second moving control part 90 b oscillates large scale polarizer 10 move in one way for a distance of bħδ(δ<<b) one or more times along the Y axis during the photo-alignment stage.
Accordingly, when the large scale polarizer moves in the manner described above, the uneven illuminance shown in
With the above triangular configuration, large scale polarizer 100 obtains a uniform illuminance by scanning only along the X axis. For example, although it scans in lengths of L along the X axis, the whole area irradiated is given equally the effects of the boundary line between the quartz substrate parts (an area of width of W in the figure), and the non-irradiated area by the polarizer holder is covered evenly.
A large scale polarizer 110 comprises one or more quartz substrate parts 115 formed in a parallelogram configuration, and a polarizer holder 113 supporting quartz substrate part 115. Quartz substrate part 115 comprises one or more layers of quartz substrate, and the quartz substrate parts are linked in one direction.
With the above parallelogram configuration, large scale polarizer 110 obtains a uniform illuminance by moving only along the X axis. For example, although it scans in lengths of L along the S axis, the whole area irradiated is given equally the effects of the boundary line between the quartz substrate parts (an area of width of W in the figure), and the non-irradiated area by the polarizer holder is covered evenly. Moreover, compared with quartz substrate part 105 in
A light from a lamp 7 is reflected by a cold mirror 61 onto a small scale polarizer 20, focused by a fly eye lens (homogenizer) 31, and transmitted through another small scale polarizer 40. The light if reflected again by a reflective mirror 63 onto a collimation lens 30, the light recollimated and focused becomes an unpolarized parallel light. The unpolarized parallel light is incident at the Brewster's angle θB on the quartz substrate part of large scale polarizer 100 (or 110) (see the
A part of the light is reflected, and other part of the light is transmitted and irradiated over alignment layer 50. Moving control part 90 makes the large scale polarizer move in the X axis direction during the irradiation of the photo-alignment layer (refer to
In the above polarizer system of
Moreover, although the polarizer systems shown in
It is further understood by those skilled in the art that the foregoing description is a preferred embodiment of the disclosed device and that various changes and modifications may be made in the invention without departing from the spirit and scope thereof.
It will be apparent to those skilled in the art that various modifications and variations can be made in the polarizer and polarizer system of the present invention and in construction thereof without departing from the scope or spirit of the invention. As an example, while the embodiments discussed above place the polarizer at the Brewster's angle, it need not be at the Brewster's angle. Moreover, the movement of the polarizer is not limited to the particular X and Y directions described above—it may be moved in any fashion as long as the alignment layer is uniformly irradiated, as needed.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
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|U.S. Classification||359/485.02, 359/489.15, 359/489.2|
|International Classification||G02B5/30, G02B27/28|
|Oct 17, 2008||AS||Assignment|
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